31 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Plattsburgh | 1 | 19,898 | 19,820 | 0.08% | 3,706 | 5.37 | City |
| Plattsburgh town | 2 | 11,708 | 11,861 | -0.45% | 257 | 45.58 | Town |
| Peru town | 3 | 6,618 | 6,772 | -0.41% | 84 | 78.89 | Town |
| Champlain town | 4 | 5,609 | 5,736 | -0.43% | 110 | 51.19 | Town |
| Beekmantown town | 5 | 5,356 | 5,501 | -0.54% | 89 | 60.42 | Town |
| Schuyler Falls town | 6 | 4,835 | 4,842 | 0.1% | 131 | 36.96 | Town |
| Chazy town | 7 | 3,990 | 4,087 | -0.52% | 74 | 54.15 | Town |
| Saranac town | 8 | 3,784 | 3,852 | -0.39% | 33 | 114.84 | Town |
| Dannemora town | 9 | 3,430 | 4,031 | 5.44% | 58 | 59.08 | Town |
| Mooers town | 10 | 3,369 | 3,454 | -0.56% | 39 | 87.47 | Town |
| Keeseville | 11 | 3,181 | 2,557 | 7.14% | 528 | 6.02 | CDP |
| Au Sable town | 12 | 3,110 | 3,183 | -0.48% | 80 | 38.90 | Town |
| Altona town | 13 | 2,833 | 2,624 | 5.63% | 28 | 100.98 | Town |
| Rouses Point | 14 | 2,186 | 2,245 | -0.55% | 1,249 | 1.75 | Village |
| Peru | 15 | 1,861 | 1,557 | 0.98% | 967 | 1.92 | CDP |
| Ellenburg town | 16 | 1,768 | 1,835 | -0.73% | 17 | 106.57 | Town |
| Dannemora | 17 | 1,713 | 3,287 | -15.53% | 1,419 | 1.21 | Village |
| Morrisonville | 18 | 1,662 | 1,551 | 0.42% | 494 | 3.36 | CDP |
| Black Brook town | 19 | 1,428 | 1,451 | -0.35% | 11 | 130.20 | Town |
| Plattsburgh West | 20 | 1,293 | 1,230 | -0.39% | 682 | 1.90 | CDP |
| Cumberland Head | 21 | 1,290 | 1,495 | -1.68% | 334 | 3.86 | CDP |
| Champlain | 22 | 1,125 | 1,167 | -0.71% | 772 | 1.46 | Village |
| Cadyville | 23 | 686 | 525 | 7.19% | 632 | 1.09 | CDP |
| Altona | 24 | 639 | 819 | -0.93% | 374 | 1.71 | CDP |
| Au Sable Forks | 25 | 598 | 416 | 0.5% | 241 | 2.48 | CDP |
| Mooers | 26 | 545 | 442 | 1.3% | 449 | 1.21 | CDP |
| West Chazy | 27 | 469 | 400 | -0.85% | 250 | 1.88 | CDP |
| Chazy | 28 | 454 | 717 | -1.52% | 268 | 1.70 | CDP |
| Lyon Mountain | 29 | 207 | 287 | -6.33% | 20 | 10.51 | CDP |
| Redford | 30 | 201 | 258 | -8.22% | 149 | 1.35 | CDP |
| Parc | 31 | 150 | 225 | -4.46% | 122 | 1.23 | CDP |
Plattsburgh is the largest city in Clinton County, with a population of 19,898.
Parc is the smallest city in Clinton County.
There are 31 cities in Clinton County, New York.